I'd like for it to be in the 300fps @ 29"DL with a 350 or so grain arrow
The only chance you have of that happening is at 70#.
My 08' Constitution came in at 310 out of the box at 29"/ 70.3# / 350gr arrow.
Get your peep and loop or whatever you want on the string and you'll be hovering right around 300fps but needing at least 70# to get there with a 350gr arrow.